89 Octane = Faster ?
Thread Starter
Senior Member
Joined: Jan 2003
Posts: 8,079
From: union, new jersey
alright, i was running less than a quarter tank yesturday.... so i decided to go to the nearest gas station and fill up with 94 octane..... but as the guy was filling up, i realized that the dumb **** was pumping in 89 octane!!!
so i told him to stop the pump at 5 bucks..... so my gas was about half 94 octane and half 89 octane.
well as i was driving... i realized that my car was more responsive and somewhat faster....... i dont know if that makes sense to any of you
i usually only put 94 octane in my car.....
so i told him to stop the pump at 5 bucks..... so my gas was about half 94 octane and half 89 octane.
well as i was driving... i realized that my car was more responsive and somewhat faster....... i dont know if that makes sense to any of you
i usually only put 94 octane in my car.....
Super Moderator
Joined: Jan 2002
Posts: 3,928
From: New Jersey
maintain 94..
additional power felt couldve been the result of other factors..
air temp.. coolant temp.. barometric pressure .. aerodynamics.. etc..
higher the octane... better your resistance to detonation..
additional power felt couldve been the result of other factors..
air temp.. coolant temp.. barometric pressure .. aerodynamics.. etc..
higher the octane... better your resistance to detonation..
Thread Starter
Senior Member
Joined: Jan 2003
Posts: 8,079
From: union, new jersey
i was thinking things through........
im in need of a spark plug change soon, and since lower octane combust easier than high octane, i was probably burning all the fuel rather than having it combust in my exhaust.
im in need of a spark plug change soon, and since lower octane combust easier than high octane, i was probably burning all the fuel rather than having it combust in my exhaust.
Super Moderator
Joined: Apr 2002
Posts: 2,535
From: VA
I'm not a chemical engineer or a petroleum products expert, but I have heard that there is actually more "energy" in lower octane fuels. The higher the AKI or "anti-knock index" the lower the available power.
This seems to go against conventional wisdom, but it does not. The higher AKI lets you run the timing further advanced to produce more power.
All other things being the same, you should notice more power with lower octane fuels. But you've got to be careful!
This seems to go against conventional wisdom, but it does not. The higher AKI lets you run the timing further advanced to produce more power.
All other things being the same, you should notice more power with lower octane fuels. But you've got to be careful!
Super Moderator
Joined: Sep 2002
Posts: 5,425
From: Tallahassee, FL
Originally Posted by 1988RedT2' date='Feb 6 2004, 04:34 PM
I'm not a chemical engineer or a petroleum products expert, but I have heard that there is actually more "energy" in lower octane fuels. The higher the AKI or "anti-knock index" the lower the available power.
This seems to go against conventional wisdom, but it does not. The higher AKI lets you run the timing further advanced to produce more power.
All other things being the same, you should notice more power with lower octane fuels. But you've got to be careful!
This seems to go against conventional wisdom, but it does not. The higher AKI lets you run the timing further advanced to produce more power.
All other things being the same, you should notice more power with lower octane fuels. But you've got to be careful!
lower octane, higher cumbustibility (bad for high compression motors), lower flash point
higher octane, therefore, allows for higher compression with less risk of early combustion (or pre ignition, or whatever it's called)
